A member of a white supremacist gang was sentenced to 20 years in federal prison last week for dealing drugs in Fort Worth, authorities say.

Scott Grigsby

(Tarrant County Jail)

Scott "Skinny Pup" Edward Grigsby, 44, of White Settlement was sentenced Friday by U.S. District Judge John McBryde, according to the U.S. attorney's office in Dallas.

Grigsby pleaded guilty in May to one count of conspiracy to possess with intent to distribute a controlled substance, in this case methamphetamine, officials announced Tuesday.

He's been identified as a member of the Aryan Circle, the second-largest white supremacist prison gang in Texas and one of the largest such gangs in the U.S., according to the Anti-Defamation League.

In 2015 and 2016, the Bureau of Alcohol, Tobacco, Firearms and Explosives and the Texas Department of Public Safety investigated Grigsby, placing him under surveillance and making a series of undercover purchases, court records show.

During this time, Grigsby received and sold meth on multiple occasions from various sources in and around Fort Worth, according to case documents.

Text messages were an important piece of the puzzle for investigators. A flurry of messages to and from Grigsby revealed he sometimes used coded language to request drugs and money. Other times, the messages were "self-explanatory," one investigator wrote.

"Dude that's a gram of crushed up shards put it in a pipe and see what is like," Grigsby sent to an unknown person on April 7, 2016.

On two occasions, officers searched Grigsby's homes — one on Downe Drive in White Settlement and one on Calmont Avenue in Fort Worth — and found drugs both times.

On Feb. 4, 2016, officers found 67 grams of meth, prescription medication, small plastic bags, a small black book with drug notes, a small digital scale and drug paraphernalia in his bedroom.

Another search by the Fort Worth Police Department, in April 2016, found nearly 13.5 grams of meth in Grigsby's bedroom.

During interviews, multiple people named Grigsby as their meth supplier.